/**
 * http://github.com/Valums-File-Uploader/file-uploader
 * 
 * Multiple file upload component with progress-bar, drag-and-drop.
 * 
 * Have ideas for improving this JS for the general community? Submit your
 * changes at: https://github.com/Valums-File-Uploader/file-uploader Readme at
 * https://github.com/valums/file-uploader/blob/2.1.2/readme.md
 * 
 * VERSION 2.1.2 Original version: 1.0 © 2010 Andrew Valums (
 * andrew(at)valums.com ) Current Maintainer (2.0+): © 2012, Ray Nicholus (
 * fineuploader(at)garstasio.com )
 * 
 * Licensed under MIT license, GNU GPL 2 or later, GNU LGPL 2 or later, see
 * license.txt.
 */

//
// Helper functions
//
var qq = qq || {};

/**
 * Adds all missing properties from second obj to first obj
 */
qq.extend = function(first, second) {
	for ( var prop in second) {
		first[prop] = second[prop];
	}
};

/**
 * Searches for a given element in the array, returns -1 if it is not present.
 * 
 * @param {Number}
 *            [from] The index at which to begin the search
 */
qq.indexOf = function(arr, elt, from) {
	if (arr.indexOf)
		return arr.indexOf(elt, from);

	from = from || 0;
	var len = arr.length;

	if (from < 0)
		from += len;

	for (; from < len; from++) {
		if (from in arr && arr[from] === elt) {
			return from;
		}
	}
	return -1;
};

qq.getUniqueId = (function() {
	var id = 0;
	return function() {
		return id++;
	};
})();

//
// Browsers and platforms detection

qq.ie = function() {
	return navigator.userAgent.indexOf('MSIE') != -1;
}
qq.safari = function() {
	return navigator.vendor != undefined
			&& navigator.vendor.indexOf("Apple") != -1;
}
qq.chrome = function() {
	return navigator.vendor != undefined
			&& navigator.vendor.indexOf('Google') != -1;
}
qq.firefox = function() {
	return (navigator.userAgent.indexOf('Mozilla') != -1
			&& navigator.vendor != undefined && navigator.vendor == '');
}
qq.windows = function() {
	return navigator.platform == "Win32";
}

//
// Events

/** Returns the function which detaches attached event */
qq.attach = function(element, type, fn) {
	if (element.addEventListener) {
		element.addEventListener(type, fn, false);
	} else if (element.attachEvent) {
		element.attachEvent('on' + type, fn);
	}
	return function() {
		qq.detach(element, type, fn)
	}
};
qq.detach = function(element, type, fn) {
	if (element.removeEventListener) {
		element.removeEventListener(type, fn, false);
	} else if (element.attachEvent) {
		element.detachEvent('on' + type, fn);
	}
};

qq.preventDefault = function(e) {
	if (e.preventDefault) {
		e.preventDefault();
	} else {
		e.returnValue = false;
	}
};

//
// Node manipulations

/**
 * Insert node a before node b.
 */
qq.insertBefore = function(a, b) {
	b.parentNode.insertBefore(a, b);
};
qq.remove = function(element) {
	element.parentNode.removeChild(element);
};

qq.contains = function(parent, descendant) {
	// compareposition returns false in this case
	if (parent == descendant)
		return true;

	if (parent.contains) {
		return parent.contains(descendant);
	} else {
		return !!(descendant.compareDocumentPosition(parent) & 8);
	}
};

/**
 * Creates and returns element from html string Uses innerHTML to create an
 * element
 */
qq.toElement = (function() {
	var div = document.createElement('div');
	return function(html) {
		div.innerHTML = html;
		var element = div.firstChild;
		div.removeChild(element);
		return element;
	};
})();

//
// Node properties and attributes

/**
 * Sets styles for an element. Fixes opacity in IE6-8.
 */
qq.css = function(element, styles) {
	if (styles.opacity != null) {
		if (typeof element.style.opacity != 'string'
				&& typeof (element.filters) != 'undefined') {
			styles.filter = 'alpha(opacity=' + Math.round(100 * styles.opacity)
					+ ')';
		}
	}
	qq.extend(element.style, styles);
};
qq.hasClass = function(element, name) {
	var re = new RegExp('(^| )' + name + '( |$)');
	return re.test(element.className);
};
qq.addClass = function(element, name) {
	if (!qq.hasClass(element, name)) {
		element.className += ' ' + name;
	}
};
qq.removeClass = function(element, name) {
	var re = new RegExp('(^| )' + name + '( |$)');
	element.className = element.className.replace(re, ' ').replace(
			/^\s+|\s+$/g, "");
};
qq.setText = function(element, text) {
	element.innerText = text;
	element.textContent = text;
};

//
// Selecting elements

qq.children = function(element) {
	var children = [], child = element.firstChild;

	while (child) {
		if (child.nodeType == 1) {
			children.push(child);
		}
		child = child.nextSibling;
	}

	return children;
};

qq.getByClass = function(element, className) {
	if (element.querySelectorAll) {
		return element.querySelectorAll('.' + className);
	}

	var result = [];
	var candidates = element.getElementsByTagName("*");
	var len = candidates.length;

	for (var i = 0; i < len; i++) {
		if (qq.hasClass(candidates[i], className)) {
			result.push(candidates[i]);
		}
	}
	return result;
};

/**
 * obj2url() takes a json-object as argument and generates a querystring. pretty
 * much like jQuery.param()
 * 
 * how to use:
 * 
 * `qq.obj2url({a:'b',c:'d'},'http://any.url/upload?otherParam=value');`
 * 
 * will result in:
 * 
 * `http://any.url/upload?otherParam=value&a=b&c=d`
 * 
 * @param Object
 *            JSON-Object
 * @param String
 *            current querystring-part
 * @return String encoded querystring
 */
qq.obj2url = function(obj, temp, prefixDone) {
	var uristrings = [], prefix = '&', add = function(nextObj, i) {
		var nextTemp = temp ? (/\[\]$/.test(temp)) // prevent double-encoding
		? temp : temp + '[' + i + ']' : i;
		if ((nextTemp != 'undefined') && (i != 'undefined')) {
			uristrings
					.push((typeof nextObj === 'object') ? qq.obj2url(nextObj,
							nextTemp, true)
							: (Object.prototype.toString.call(nextObj) === '[object Function]') ? encodeURIComponent(nextTemp)
									+ '=' + encodeURIComponent(nextObj())
									: encodeURIComponent(nextTemp) + '='
											+ encodeURIComponent(nextObj));
		}
	};

	if (!prefixDone && temp) {
		prefix = (/\?/.test(temp)) ? (/\?$/.test(temp)) ? '' : '&' : '?';
		uristrings.push(temp);
		uristrings.push(qq.obj2url(obj));
	} else if ((Object.prototype.toString.call(obj) === '[object Array]')
			&& (typeof obj != 'undefined')) {
		// we wont use a for-in-loop on an array (performance)
		for (var i = 0, len = obj.length; i < len; ++i) {
			add(obj[i], i);
		}
	} else if ((typeof obj != 'undefined') && (obj !== null)
			&& (typeof obj === "object")) {
		// for anything else but a scalar, we will use for-in-loop
		for ( var i in obj) {
			add(obj[i], i);
		}
	} else {
		uristrings.push(encodeURIComponent(temp) + '='
				+ encodeURIComponent(obj));
	}

	if (temp) {
		return uristrings.join(prefix);
	} else {
		return uristrings.join(prefix).replace(/^&/, '').replace(/%20/g, '+');
	}
};

//
//
// Uploader Classes
//
//

var qq = qq || {};

/**
 * Creates upload button, validates upload, but doesn't create file list or dd.
 */
qq.FileUploaderBasic = function(o) {
	var that = this;
	this._options = {
		// set to true to see the server response
		debug : false,
		action : '/server/upload',
		params : {},
		customHeaders : {},
		button : null,
		multiple : true,
		maxConnections : 3,
		disableCancelForFormUploads : false,
		autoUpload : true,
		forceMultipart : false,
		// validation
		allowedExtensions : [],
		acceptFiles : null, // comma separated string of mime-types for browser
							// to display in browse dialog
		sizeLimit : 0,
		minSizeLimit : 0,
		fileNumLimit : 10,//文件上传个数限制
		ifOverrange:function(limit){
			
		},
		stopOnFirstInvalidFile : true,
		// events
		// return false to cancel submit
		onSubmit : function(id, fileName) {
		},
		onComplete : function(id, fileName, responseJSON) {
		},
		onCancel : function(id, fileName) {
		},
		onUpload : function(id, fileName, xhr) {
		},
		onProgress : function(id, fileName, loaded, total) {
		},
		onError : function(id, fileName, reason) {
		},
		// messages
		messages : {
			typeError : "{file} 格式不合法. 只允许上传格式： {extensions} ",
			sizeError : "{file} 太大,文件不能超过 {sizeLimit}.",
			minSizeError : "{file} 太小, 文件最小不能少于 {minSizeLimit}.",
			emptyError : "{file} 是个空文件，请检查.",
			noFilesError : "没选择文件.",
			onLeave : "还有文件在上传，确定要退出此页面吗."
		},
		showMessage : function(message) {
			var title="提示";
			var btnName="确定";
			if(message==""||message==undefined){
//				alert("上传失败，未知异常！");
				showTipDiv2(title,"上传失败，未知异常！",btnName)
			}else{
//				alert(message);
				showTipDiv2(title,message,btnName)
			}
		},
		inputName : 'qqfile'
	};
	qq.extend(this._options, o);
	this._wrapCallbacks();
	qq.extend(this, qq.DisposeSupport);

	// number of files being uploaded
	this._filesInProgress = 0;

	this._storedFileIds = [];

	this._handler = this._createUploadHandler();

	if (this._options.button) {
		this._button = this._createUploadButton(this._options.button);
	}

	this._preventLeaveInProgress();
};

qq.FileUploaderBasic.prototype = {
	log : function(str) {
		if (this._options.debug && window.console)
			console.log('[uploader] ' + str);
	},
	setParams : function(params) {
		this._options.params = params;
	},
	getInProgress : function() {
		return this._filesInProgress;
	},
	uploadStoredFiles : function() {
		while (this._storedFileIds.length) {
			this._filesInProgress++;
			this._handler.upload(this._storedFileIds.shift(),
					this._options.params);
		}
	},
	clearStoredFiles : function() {
		this._storedFileIds = [];
	},
	_createUploadButton : function(element) {
		var self = this;

		var button = new qq.UploadButton({
			element : element,
			multiple : this._options.multiple
					&& qq.UploadHandlerXhr.isSupported(),
			acceptFiles : this._options.acceptFiles,
			uploadButtonID : this._options.uploadButtonID,
			onChange : function(input) {
				self._onInputChange(input);
			}
		});

		this.addDisposer(function() {
			button.dispose();
		});
		return button;
	},
	_createUploadHandler : function() {
		var self = this, handlerClass;

		if (qq.UploadHandlerXhr.isSupported()) {
			handlerClass = 'UploadHandlerXhr';
		} else {
			handlerClass = 'UploadHandlerForm';
		}

		var handler = new qq[handlerClass]({
			debug : this._options.debug,
			action : this._options.action,
			forceMultipart : this._options.forceMultipart,
			maxConnections : this._options.maxConnections,
			customHeaders : this._options.customHeaders,
			inputName : this._options.inputName,
			demoMode : this._options.demoMode,
			onProgress : function(id, fileName, loaded, total) {
				self._onProgress(id, fileName, loaded, total);
				self._options.onProgress(id, fileName, loaded, total);
			},
			onComplete : function(id, fileName, result) {
				self._onComplete(id, fileName, result);
				self._options.onComplete(id, fileName, result);
			},
			onCancel : function(id, fileName) {
				self._onCancel(id, fileName);
				self._options.onCancel(id, fileName);
			},
			onError : self._options.onError,
			onUpload : function(id, fileName, xhr) {
				self._onUpload(id, fileName, xhr);
				self._options.onUpload(id, fileName, xhr);
			}
		});

		return handler;
	},
	_preventLeaveInProgress : function() {
		var self = this;

		this._attach(window, 'beforeunload', function(e) {
			if (!self._filesInProgress) {
				return;
			}

			var e = e || window.event;
			// for ie, ff
			e.returnValue = self._options.messages.onLeave;
			// for webkit
			return self._options.messages.onLeave;
		});
	},
	_onSubmit : function(id, fileName) {
		if (this._options.autoUpload) {
			this._filesInProgress++;
		}
	},
	_onProgress : function(id, fileName, loaded, total) {
	},
	_onComplete : function(id, fileName, result) {
		this._filesInProgress--;

		if (!result.success) {
			var errorReason = result.error ? result.error
					: "Upload failure reason unknown";
			this._options.onError(id, fileName, errorReason);
		}
	},
	_onCancel : function(id, fileName) {
		var storedFileIndex = qq.indexOf(this._storedFileIds, id);
		if (this._options.autoUpload || storedFileIndex < 0) {
			this._filesInProgress--;
		} else if (!this._options.autoUpload) {
			this._storedFileIds.splice(storedFileIndex, 1);
		}
	},
	_onUpload : function(id, fileName, xhr) {
	},
	_onInputChange : function(input) {
		if (this._handler instanceof qq.UploadHandlerXhr) {
			this._uploadFileList(input.files);
		} else {
			if (this._validateFile(input)) {
				this._uploadFile(input);
			}
		}
		this._button.reset();
	},
	_uploadFileList : function(files) {
		if (files.length > 0) {
			for (var i = 0; i < files.length; i++) {
				if (this._validateFile(files[i])) {
					this._uploadFile(files[i]);
				} else {
					if (this._options.stopOnFirstInvalidFile) {
						return;
					}
				}
			}
		} else {
			this._error('noFilesError', "");
		}
	},
	_uploadFile : function(fileContainer) {
		var id = this._handler.add(fileContainer);
		var fileName = this._handler.getName(id);
		if (this._options.onSubmit(id, fileName) !== false) {
			this._onSubmit(id, fileName);
			if (this._options.autoUpload) {
				this._handler.upload(id, this._options.params);
			} else {
				this._storeFileForLater(id);
			}
		}
	},
	_storeFileForLater : function(id) {
		this._storedFileIds.push(id);
	},
	_validateFile : function(file) {
		var name, size;
		if (file.value) {
			// it is a file input
			// get input value and remove path to normalize
			name = file.value.replace(/.*(\/|\\)/, "");
		} else {
			// fix missing properties in Safari 4 and firefox 11.0a2
			name = (file.fileName !== null && file.fileName !== undefined) ? file.fileName
					: file.name;
			size = (file.fileSize !== null && file.fileSize !== undefined) ? file.fileSize
					: file.size;
		}
		if(this._options.fileNumLimit!=0&&this._options.ifOverrange(this._options.fileNumLimit)){
			return false;
		}
		if (!this._isAllowedExtension(name)) {
			this._error('typeError', name);
			return false;

		} else if (size === 0) {
			this._error('emptyError', name);
			return false;

		} else if (size && this._options.sizeLimit
				&& size > this._options.sizeLimit) {
			this._error('sizeError', name);
			return false;

		} else if (size && size < this._options.minSizeLimit) {
			this._error('minSizeError', name);
			return false;
		}

		return true;
	},
	_error : function(code, fileName) {
		var message = this._options.messages[code];
		function r(name, replacement) {
			message = message.replace(name, replacement);
		}

		var extensions = this._options.allowedExtensions.join(', ');

		r('{file}', this._formatFileName(fileName));
		r('{extensions}', extensions);
		r('{sizeLimit}', this._formatSize(this._options.sizeLimit));
		r('{minSizeLimit}', this._formatSize(this._options.minSizeLimit));

		this._options.onError(null, fileName, message);
		this._options.showMessage(message);
	},
	_formatFileName : function(name) {
		if (name.length > 33) {
			name = name.slice(0, 19) + '...' + name.slice(-13);
		}
		return name;
	},
	_isAllowedExtension : function(fileName) {
		var ext = (-1 !== fileName.indexOf('.')) ? fileName
				.replace(/.*[.]/, '').toLowerCase() : '';
		var allowed = this._options.allowedExtensions;

		if (!allowed.length) {
			return true;
		}

		for (var i = 0; i < allowed.length; i++) {
			if (allowed[i].toLowerCase() == ext) {
				return true;
			}
		}

		return false;
	},
	_formatSize : function(bytes) {
		var i = -1;
		do {
			bytes = bytes / 1024;
			i++;
		} while (bytes > 99);

		return Math.max(bytes, 0.1).toFixed(1)
				+ [ 'kB', 'MB', 'GB', 'TB', 'PB', 'EB' ][i];
	},
	_wrapCallbacks : function() {
		var self, safeCallback;

		self = this;

		safeCallback = function(callback, args) {
			try {
				return callback.apply(self, args);
			} catch (exception) {
				self.log("Caught " + exception + " in callback: " + callback);
			}
		}

		for ( var prop in this._options) {
			if (/^on[A-Z]/.test(prop)) {
				(function() {
					var oldCallback = self._options[prop];
					self._options[prop] = function() {
						return safeCallback(oldCallback, arguments);
					}
				}());
			}
		}
	}
};

/**
 * Class that creates upload widget with drag-and-drop and file list
 * 
 * @inherits qq.FileUploaderBasic
 */
qq.FileUploader = function(o) {
	// call parent constructor
	qq.FileUploaderBasic.apply(this, arguments);

	// additional options
	qq
			.extend(
					this._options,
					{
						element : null,
						// if set, will be used instead of qq-upload-list in
						// template
						listElement : null,
						dragText : '把文件拖动到此区域',
						extraDropzones : [],
						hideDropzones : true,
						disableDefaultDropzone : false,
						uploadButtonText : '选择文件',
						cancelButtonText : '取消',
						failUploadText : '上传失败',

						template : '<div class="qq-uploader">'
								+ (!this._options.disableDefaultDropzone ? '<div class="qq-upload-drop-area"><span>{dragText}</span></div>'
										: '')
								+ (!this._options.button ? '<div class="qq-upload-button '
										+ (this._options.buttonClass ? this._options.buttonClass
												: "")
										+ '">{uploadButtonText}</div>'
										: '')
								+ (!this._options.listElement ? '<ul class="qq-upload-list" style="display:none"></ul>'
										: '') + '</div>',

						// template for one item in file list
						fileTemplate : '<li>'
								+ '<div class="qq-progress-bar" style="display:none"></div>'
								+ '<span class="qq-upload-spinner"></span>'
								+ '<span class="qq-upload-finished"></span>'
								+ '<span class="qq-upload-file"></span>'
								+ '<span class="qq-upload-size"></span>'
								+ '<a class="qq-upload-cancel" href="#">{cancelButtonText}</a>'
								+ '<span class="qq-upload-failed-text">{failUploadtext}</span>'
								+ '</li>',

						classes : {
							// used to get elements from templates
							button : 'qq-upload-button',
							drop : 'qq-upload-drop-area',
							dropActive : 'qq-upload-drop-area-active',
							dropDisabled : 'qq-upload-drop-area-disabled',
							list : 'qq-upload-list',
							progressBar : 'qq-progress-bar',
							file : 'qq-upload-file',
							spinner : 'qq-upload-spinner',
							finished : 'qq-upload-finished',
							size : 'qq-upload-size',
							cancel : 'qq-upload-cancel',
							failText : 'qq-upload-failed-text',

							// added to list item <li> when upload completes
							// used in css to hide progress spinner
							success : 'qq-upload-success',
							fail : 'qq-upload-fail',

							successIcon : null,
							failIcon : null
						},
						extraMessages : {
							formatProgress : "{percent}% of {total_size}",
							tooManyFilesError : "You may only drop one file"
						},
						failedUploadTextDisplay : {
							mode : 'default', // default, custom, or none
							maxChars : 50,
							responseProperty : 'error',
							enableTooltip : true
						}
					});
	// overwrite options with user supplied
	qq.extend(this._options, o);
	this._wrapCallbacks();

	qq.extend(this._options.messages, this._options.extraMessages);

	// overwrite the upload button text if any
	// same for the Cancel button and Fail message text
	this._options.template = this._options.template.replace(/\{dragText\}/g,
			this._options.dragText);
	this._options.template = this._options.template.replace(
			/\{uploadButtonText\}/g, this._options.uploadButtonText);
	this._options.fileTemplate = this._options.fileTemplate.replace(
			/\{cancelButtonText\}/g, this._options.cancelButtonText);
	this._options.fileTemplate = this._options.fileTemplate.replace(
			/\{failUploadtext\}/g, this._options.failUploadText);

	this._element = this._options.element;
	this._element.innerHTML = this._options.template;
	this._listElement = this._options.listElement
			|| this._find(this._element, 'list');

	this._classes = this._options.classes;

	if (!this._button) {
		this._button = this._createUploadButton(this._find(this._element,
				'button'));
	}

	this._bindCancelEvent();
	this._setupDragDrop();
};

// inherit from Basic Uploader
qq.extend(qq.FileUploader.prototype, qq.FileUploaderBasic.prototype);

qq
		.extend(
				qq.FileUploader.prototype,
				{
					clearStoredFiles : function() {
						qq.FileUploaderBasic.prototype.clearStoredFiles.apply(
								this, arguments);
						this._listElement.innerHTML = "";
					},
					addExtraDropzone : function(element) {
						this._setupExtraDropzone(element);
					},
					removeExtraDropzone : function(element) {
						var dzs = this._options.extraDropzones;
						for ( var i in dzs)
							if (dzs[i] === element)
								return this._options.extraDropzones
										.splice(i, 1);
					},
					_leaving_document_out : function(e) {
						return ((qq.chrome() || (qq.safari() && qq.windows()))
								&& e.clientX == 0 && e.clientY == 0) // null
																		// coords
																		// for
																		// Chrome
																		// and
																		// Safari
																		// Windows
								|| (qq.firefox() && !e.relatedTarget); // null
																		// e.relatedTarget
																		// for
																		// Firefox
					},
					_storeFileForLater : function(id) {
						qq.FileUploaderBasic.prototype._storeFileForLater
								.apply(this, arguments);
						var item = this._getItemByFileId(id);
						this._find(item, 'spinner').style.display = "none";
					},
					/**
					 * Gets one of the elements listed in this._options.classes
					 */
					_find : function(parent, type) {
						var element = qq.getByClass(parent,
								this._options.classes[type])[0];
						if (!element) {
							throw new Error('element not found ' + type);
						}

						return element;
					},
					_setupExtraDropzone : function(element) {
						this._options.extraDropzones.push(element);
						this._setupDropzone(element);
					},
					_setupDropzone : function(dropArea) {
						var self = this;

						var dz = new qq.UploadDropZone(
								{
									element : dropArea,
									onEnter : function(e) {
										qq.addClass(dropArea,
												self._classes.dropActive);
										e.stopPropagation();
									},
									onLeave : function(e) {
										// e.stopPropagation();
									},
									onLeaveNotDescendants : function(e) {
										qq.removeClass(dropArea,
												self._classes.dropActive);
									},
									onDrop : function(e) {
										if (self._options.hideDropzones) {
											dropArea.style.display = 'none';
										}
										qq.removeClass(dropArea,
												self._classes.dropActive);
										if (e.dataTransfer.files.length > 1
												&& !self._options.multiple) {
											self
													._error(
															'tooManyFilesError',
															"");
										} else {
											self
													._uploadFileList(e.dataTransfer.files);
										}
									}
								});

						this.addDisposer(function() {
							dz.dispose();
						});

						if (this._options.hideDropzones) {
							dropArea.style.display = 'none';
						}
					},
					_setupDragDrop : function() {
						var self = this;

						if (!this._options.disableDefaultDropzone) {
							var dropArea = this._find(this._element, 'drop');
							this._options.extraDropzones.push(dropArea);
						}

						var dropzones = this._options.extraDropzones;
						var i;
						for (i = 0; i < dropzones.length; i++) {
							this._setupDropzone(dropzones[i]);
						}

						// IE <= 9 does not support the File API used for
						// drag+drop uploads
						// Any volunteers to enable & test this for IE10?
						if (!this._options.disableDefaultDropzone && !qq.ie()) {
							this._attach(document, 'dragenter', function(e) {
								if (qq.hasClass(dropArea,
										self._classes.dropDisabled))
									return;

								dropArea.style.display = 'block';
								for (i = 0; i < dropzones.length; i++) {
									dropzones[i].style.display = 'block';
								}

							});
						}
						this._attach(document, 'dragleave', function(e) {
							// only fire when leaving document out
							if (self._options.hideDropzones
									&& qq.FileUploader.prototype
											._leaving_document_out(e)) {
								for (i = 0; i < dropzones.length; i++) {
									dropzones[i].style.display = 'none';
								}
							}
						});
						qq.attach(document, 'drop', function(e) {
							if (self._options.hideDropzones) {
								for (i = 0; i < dropzones.length; i++) {
									dropzones[i].style.display = 'none';
								}
							}
							e.preventDefault();
						});
					},
					_onSubmit : function(id, fileName) {
						qq.FileUploaderBasic.prototype._onSubmit.apply(this,
								arguments);
						this._addToList(id, fileName);
					},
					// Update the progress bar & percentage as the file is
					// uploaded
					_onProgress : function(id, fileName, loaded, total) {
						qq.FileUploaderBasic.prototype._onProgress.apply(this,
								arguments);

						var item = this._getItemByFileId(id);

						if (loaded === total) {
							var cancelLink = this._find(item, 'cancel');
							cancelLink.style.display = 'none';
						}

						var size = this._find(item, 'size');
						size.style.display = 'inline';

						var text;
						var percent = Math.round(loaded / total * 100);

						if (loaded != total) {
							// If still uploading, display percentage
							text = this._formatProgress(loaded, total);
						} else {
							// If complete, just display final size
							text = this._formatSize(total);
						}

						// Update progress bar <span> tag
						this._find(item, 'progressBar').style.width = percent
								+ '%';

						qq.setText(size, text);
					},
					_onComplete : function(id, fileName, result) {
						qq.FileUploaderBasic.prototype._onComplete.apply(this,
								arguments);

						var item = this._getItemByFileId(id);

						qq.remove(this._find(item, 'progressBar'));

						if (!this._options.disableCancelForFormUploads
								|| qq.UploadHandlerXhr.isSupported()) {
							qq.remove(this._find(item, 'cancel'));
						}
						qq.remove(this._find(item, 'spinner'));

						if (result.success) {
							qq.addClass(item, this._classes.success);
							if (this._classes.successIcon) {
								this._find(item, 'finished').style.display = "inline-block";
								qq.addClass(item, this._classes.successIcon)
							}
						} else {
							qq.addClass(item, this._classes.fail);
							if (this._classes.failIcon) {
								this._find(item, 'finished').style.display = "inline-block";
								qq.addClass(item, this._classes.failIcon)
							}
							this._controlFailureTextDisplay(item, result);
						}
					},
					_onUpload : function(id, fileName, xhr) {
						qq.FileUploaderBasic.prototype._onUpload.apply(this,
								arguments);

						var item = this._getItemByFileId(id);
						if (qq.UploadHandlerXhr.isSupported()) {
							this._find(item, 'progressBar').style.display = "block";
						}

						var spinnerEl = this._find(item, 'spinner');
						if (spinnerEl.style.display == "none") {
							spinnerEl.style.display = "inline-block";
						}
					},
					_addToList : function(id, fileName) {
						if (this._options.addtolistcallback) {
							this._options.addtolistcallback(id, fileName);
						}
						var item = qq.toElement(this._options.fileTemplate);
						if (this._options.disableCancelForFormUploads
								&& !qq.UploadHandlerXhr.isSupported()) {
							var cancelLink = this._find(item, 'cancel');
							qq.remove(cancelLink);
						}

						item.qqFileId = id;

						var fileElement = this._find(item, 'file');
						qq.setText(fileElement, this._formatFileName(fileName));
						this._find(item, 'size').style.display = 'none';
						if (!this._options.multiple)
							this._clearList();
						this._listElement.appendChild(item);
					},
					_clearList : function() {
						this._listElement.innerHTML = '';
						this.clearStoredFiles();
					},
					_getItemByFileId : function(id) {
						var item = this._listElement.firstChild;

						// there can't be txt nodes in dynamically created list
						// and we can use nextSibling
						while (item) {
							if (item.qqFileId == id)
								return item;
							item = item.nextSibling;
						}
					},
					/**
					 * delegate click event for cancel link
					 */
					_bindCancelEvent : function() {
						var self = this, list = this._listElement;

						this._attach(list, 'click', function(e) {
							e = e || window.event;
							var target = e.target || e.srcElement;

							if (qq.hasClass(target, self._classes.cancel)) {
								qq.preventDefault(e);

								var item = target.parentNode;
								while (item.qqFileId == undefined) {
									item = target = target.parentNode;
								}

								self._handler.cancel(item.qqFileId);
								qq.remove(item);
							}
						});
					},
					_formatProgress : function(uploadedSize, totalSize) {
						var message = this._options.messages.formatProgress;
						function r(name, replacement) {
							message = message.replace(name, replacement);
						}

						r('{percent}', Math.round(uploadedSize / totalSize
								* 100));
						r('{total_size}', this._formatSize(totalSize));
						return message;
					},
					_controlFailureTextDisplay : function(item, response) {
						var mode, maxChars, responseProperty, failureReason, shortFailureReason;

						mode = this._options.failedUploadTextDisplay.mode;
						maxChars = this._options.failedUploadTextDisplay.maxChars;
						responseProperty = this._options.failedUploadTextDisplay.responseProperty;

						if (mode === 'custom') {
							var failureReason = response[responseProperty];
							if (failureReason) {
								if (failureReason.length > maxChars) {
									shortFailureReason = failureReason
											.substring(0, maxChars)
											+ '...';
								}
								qq.setText(this._find(item, 'failText'),
										shortFailureReason || failureReason);

								if (this._options.failedUploadTextDisplay.enableTooltip) {
									this._showTooltip(item, failureReason);
								}
							} else {
								this
										.log("'"
												+ responseProperty
												+ "' is not a valid property on the server response.");
							}
						} else if (mode === 'none') {
							qq.remove(this._find(item, 'failText'));
						} else if (mode !== 'default') {
							this.log("failedUploadTextDisplay.mode value of '"
									+ mode + "' is not valid");
						}
					},
					// TODO turn this into a real tooltip, with click trigger
					// (so it is usable on mobile devices). See case #355 for
					// details.
					_showTooltip : function(item, text) {
						item.title = text;
					}
				});

qq.UploadDropZone = function(o) {
	this._options = {
		element : null,
		onEnter : function(e) {
		},
		onLeave : function(e) {
		},
		// is not fired when leaving element by hovering descendants
		onLeaveNotDescendants : function(e) {
		},
		onDrop : function(e) {
		}
	};
	qq.extend(this._options, o);
	qq.extend(this, qq.DisposeSupport);

	this._element = this._options.element;

	this._disableDropOutside();
	this._attachEvents();
};

qq.UploadDropZone.prototype = {
	_dragover_should_be_canceled : function() {
		return qq.safari() || (qq.firefox() && qq.windows());
	},
	_disableDropOutside : function(e) {
		// run only once for all instances
		if (!qq.UploadDropZone.dropOutsideDisabled) {

			// for these cases we need to catch onDrop to reset dropArea
			if (this._dragover_should_be_canceled) {
				qq.attach(document, 'dragover', function(e) {
					e.preventDefault();
				});
			} else {
				qq.attach(document, 'dragover', function(e) {
					if (e.dataTransfer) {
						e.dataTransfer.dropEffect = 'none';
						e.preventDefault();
					}
				});
			}

			qq.UploadDropZone.dropOutsideDisabled = true;
		}
	},
	_attachEvents : function() {
		var self = this;

		self._attach(self._element, 'dragover', function(e) {
			if (!self._isValidFileDrag(e))
				return;

			var effect = qq.ie() ? null : e.dataTransfer.effectAllowed;
			if (effect == 'move' || effect == 'linkMove') {
				e.dataTransfer.dropEffect = 'move'; // for FF (only move
													// allowed)
			} else {
				e.dataTransfer.dropEffect = 'copy'; // for Chrome
			}

			e.stopPropagation();
			e.preventDefault();
		});

		self._attach(self._element, 'dragenter', function(e) {
			if (!self._isValidFileDrag(e))
				return;

			self._options.onEnter(e);
		});

		self._attach(self._element, 'dragleave',
				function(e) {
					if (!self._isValidFileDrag(e))
						return;

					self._options.onLeave(e);

					var relatedTarget = document.elementFromPoint(e.clientX,
							e.clientY);
					// do not fire when moving a mouse over a descendant
					if (qq.contains(this, relatedTarget))
						return;

					self._options.onLeaveNotDescendants(e);
				});

		self._attach(self._element, 'drop', function(e) {
			if (!self._isValidFileDrag(e))
				return;

			e.preventDefault();
			self._options.onDrop(e);
		});
	},
	_isValidFileDrag : function(e) {
		// e.dataTransfer currently causing IE errors
		// IE9 does NOT support file API, so drag-and-drop is not possible
		// IE10 should work, but currently has not been tested - any volunteers?
		if (qq.ie())
			return false;

		var dt = e.dataTransfer,
		// do not check dt.types.contains in webkit, because it crashes safari 4
		isSafari = qq.safari();

		// dt.effectAllowed is none in Safari 5
		// dt.types.contains check is for firefox
		return dt
				&& dt.effectAllowed != 'none'
				&& (dt.files || (!isSafari && dt.types.contains && dt.types
						.contains('Files')));

	}
};

qq.UploadButton = function(o) {
	this._options = {
		element : null,
		// if set to true adds multiple attribute to file input
		multiple : false,
		acceptFiles : null,
		// name attribute of file input
		name : 'file',
		uploadButtonID :'',
		onChange : function(input) {
		},
		hoverClass : 'qq-upload-button-hover',
		focusClass : 'qq-upload-button-focus'
	};

	qq.extend(this._options, o);
	qq.extend(this, qq.DisposeSupport);

	this._element = this._options.element;

	// make button suitable container for input
	qq.css(this._element, {
		position : 'relative',
		overflow : 'hidden',
		// Make sure browse button is in the right side
		// in Internet Explorer
		direction : 'ltr'
	});

	this._input = this._createInput();
};

qq.UploadButton.prototype = {
	/* returns file input element */
	getInput : function() {
		return this._input;
	},
	/* cleans/recreates the file input */
	reset : function() {
		if (this._input.parentNode) {
			qq.remove(this._input);
		}

		qq.removeClass(this._element, this._options.focusClass);
		this._input = this._createInput();
	},
	_createInput : function() {
		var input = document.createElement("input");

		if (this._options.multiple) {
			input.setAttribute("multiple", "multiple");
		}

		if (this._options.acceptFiles)
			input.setAttribute("accept", this._options.acceptFiles);
		
		if (this._options.uploadButtonID)
			input.setAttribute("id", this._options.uploadButtonID);

		input.setAttribute("type", "file");
		input.setAttribute("name", this._options.name);

		qq.css(input, {
			// position: 'absolute',
			// in Opera only 'browse' button
			// is clickable and it is located at
			// the right side of the input
			// right: 0,
			// top: 0,
			// fontFamily: 'Arial',
			// 4 persons reported this, the max values that worked for them were
			// 243, 236, 236, 118
			// fontSize: '118px',
			// //margin: 0,
			// padding: 0,
			cursor : 'pointer',
			opacity : 0
		});

		this._element.appendChild(input);

		var self = this;
		this._attach(input, 'change', function() {
			self._options.onChange(input);
		});

		this._attach(input, 'mouseover', function() {
			qq.addClass(self._element, self._options.hoverClass);
		});
		this._attach(input, 'mouseout', function() {
			qq.removeClass(self._element, self._options.hoverClass);
		});
		this._attach(input, 'focus', function() {
			qq.addClass(self._element, self._options.focusClass);
		});
		this._attach(input, 'blur', function() {
			qq.removeClass(self._element, self._options.focusClass);
		});

		// IE and Opera, unfortunately have 2 tab stops on file input
		// which is unacceptable in our case, disable keyboard access
		if (window.attachEvent) {
			// it is IE or Opera
			input.setAttribute('tabIndex', "-1");
		}

		return input;
	}
};

/**
 * Class for uploading files, uploading itself is handled by child classes
 */
qq.UploadHandlerAbstract = function(o) {
	// Default options, can be overridden by the user
	this._options = {
		debug : false,
		action : '/upload.php',
		// maximum number of concurrent uploads
		maxConnections : 999,
		onProgress : function(id, fileName, loaded, total) {
		},
		onComplete : function(id, fileName, response) {
		},
		onCancel : function(id, fileName) {
		},
		onUpload : function(id, fileName, xhr) {
		}
	};
	qq.extend(this._options, o);

	this._queue = [];
	// params for files in queue
	this._params = [];
};
qq.UploadHandlerAbstract.prototype = {
	log : function(str) {
		if (this._options.debug && window.console)
			console.log('[uploader] ' + str);
	},
	/**
	 * Adds file or file input to the queue
	 * 
	 * @returns id
	 */
	add : function(file) {
	},
	/**
	 * Sends the file identified by id and additional query params to the server
	 */
	upload : function(id, params) {
		var len = this._queue.push(id);

		var copy = {};
		qq.extend(copy, params);
		this._params[id] = copy;

		// if too many active uploads, wait...
		if (len <= this._options.maxConnections) {
			this._upload(id, this._params[id]);
		}
	},
	/**
	 * Cancels file upload by id
	 */
	cancel : function(id) {
		this._cancel(id);
		this._dequeue(id);
	},
	/**
	 * Cancells all uploads
	 */
	cancelAll : function() {
		for (var i = 0; i < this._queue.length; i++) {
			this._cancel(this._queue[i]);
		}
		this._queue = [];
	},
	/**
	 * Returns name of the file identified by id
	 */
	getName : function(id) {
	},
	/**
	 * Returns size of the file identified by id
	 */
	getSize : function(id) {
	},
	/**
	 * Returns id of files being uploaded or waiting for their turn
	 */
	getQueue : function() {
		return this._queue;
	},
	/**
	 * Actual upload method
	 */
	_upload : function(id) {
	},
	/**
	 * Actual cancel method
	 */
	_cancel : function(id) {
	},
	/**
	 * Removes element from queue, starts upload of next
	 */
	_dequeue : function(id) {
		var i = qq.indexOf(this._queue, id);
		this._queue.splice(i, 1);

		var max = this._options.maxConnections;

		if (this._queue.length >= max && i < max) {
			var nextId = this._queue[max - 1];
			this._upload(nextId, this._params[nextId]);
		}
	}
};

/**
 * Class for uploading files using form and iframe
 * 
 * @inherits qq.UploadHandlerAbstract
 */
qq.UploadHandlerForm = function(o) {
	qq.UploadHandlerAbstract.apply(this, arguments);

	this._inputs = {};
	this._detach_load_events = {};
};
// @inherits qq.UploadHandlerAbstract
qq.extend(qq.UploadHandlerForm.prototype, qq.UploadHandlerAbstract.prototype);

qq.extend(qq.UploadHandlerForm.prototype,
				{
					add : function(fileInput) {
						fileInput.setAttribute('name', this._options.inputName);
						var id = 'qq-upload-handler-iframe' + qq.getUniqueId();

						this._inputs[id] = fileInput;

						// remove file input from DOM
						if (fileInput.parentNode) {
							qq.remove(fileInput);
						}

						return id;
					},
					getName : function(id) {
						// get input value and remove path to normalize
						return this._inputs[id].value.replace(/.*(\/|\\)/, "");
					},
					_cancel : function(id) {
						this._options.onCancel(id, this.getName(id));

						delete this._inputs[id];
						delete this._detach_load_events[id];

						var iframe = document.getElementById(id);
						if (iframe) {
							// to cancel request set src to something else
							// we use src="javascript:false;" because it doesn't
							// trigger ie6 prompt on https
							iframe.setAttribute('src', 'javascript:false;');

							qq.remove(iframe);
						}
					},
					_upload : function(id, params) {
						this._options.onUpload(id, this.getName(id), false);
						var input = this._inputs[id];

						if (!input) {
							throw new Error(
									'file with passed id was not added, or already uploaded or cancelled');
						}

						var fileName = this.getName(id);
						params[this._options.inputName] = fileName;

						var iframe = this._createIframe(id);
						var form = this._createForm(iframe, params);
						form.appendChild(input);

						var self = this;
						this._attachLoadEvent(iframe, function() {
							self.log('iframe loaded');

							var response = self._getIframeContentJSON(iframe);

							self._options.onComplete(id, fileName, response);
							self._dequeue(id);

							delete self._inputs[id];
							// timeout added to fix busy state in FF3.6
							setTimeout(function() {
								self._detach_load_events[id]();
								delete self._detach_load_events[id];
								qq.remove(iframe);
							}, 1);
						});
						form.submit();
						qq.remove(form);

						return id;
					},
					_attachLoadEvent : function(iframe, callback) {
						this._detach_load_events[iframe.id] = qq
								.attach(
										iframe,
										'load',
										function() {
											// when we remove iframe from dom
											// the request stops, but in IE load
											// event fires
											if (!iframe.parentNode) {
												return;
											}

											try {
												// fixing Opera 10.53
												if (iframe.contentDocument
														&& iframe.contentDocument.body
														&& iframe.contentDocument.body.innerHTML == "false") {
													// In Opera event is fired
													// second time
													// when body.innerHTML
													// changed from false
													// to server response
													// approx. after 1 sec
													// when we upload file with
													// iframe
													return;
												}
											} catch (error) {
												// IE may throw an "access is
												// denied" error when attempting
												// to access contentDocument on
												// the iframe in some cases
											}

											callback();
										});
					},
					/**
					 * Returns json object received by iframe from server.
					 */
					_getIframeContentJSON : function(iframe) {
						// IE may throw an "access is denied" error when
						// attempting to access contentDocument on the iframe in
						// some cases
						try {
							// iframe.contentWindow.document - for IE<7
							var doc = iframe.contentDocument ? iframe.contentDocument
									: iframe.contentWindow.document, response;

							var innerHTML = doc.body.innerHTML;
							this.log("converting iframe's innerHTML to JSON");
							this.log("innerHTML = " + innerHTML);
							// plain text response may be wrapped in <pre> tag
							if (innerHTML.slice(0, 5).toLowerCase() == '<pre>'
									&& innerHTML.slice(-6).toLowerCase() == '</pre>') {
								innerHTML = doc.body.firstChild.firstChild.nodeValue;
							}
							response = eval("(" + innerHTML + ")");
						} catch (err) {
							response = {
								success : false
							};
						}

						return response;
					},
					/**
					 * Creates iframe with unique name
					 */
					_createIframe : function(id) {
						// We can't use following code as the name attribute
						// won't be properly registered in IE6, and new window
						// on form submit will open
						// var iframe = document.createElement('iframe');
						// iframe.setAttribute('name', id);

						var iframe = qq
								.toElement('<iframe src="javascript:false;" name="'
										+ id + '" />');
						// src="javascript:false;" removes ie6 prompt on https

						iframe.setAttribute('id', id);

						iframe.style.display = 'none';
						document.body.appendChild(iframe);

						return iframe;
					},
					/**
					 * Creates form, that will be submitted to iframe
					 */
					_createForm : function(iframe, params) {
						// We can't use the following code in IE6
						// var form = document.createElement('form');
						// form.setAttribute('method', 'post');
						// form.setAttribute('enctype', 'multipart/form-data');
						// Because in this case file won't be attached to
						// request
						var protocol = this._options.demoMode ? "GET" : "POST"
						var form = qq.toElement('<form method="' + protocol
								+ '" enctype="multipart/form-data"></form>');

						var queryString = qq.obj2url(params,
								this._options.action);

						form.setAttribute('action', queryString);
						form.setAttribute('target', iframe.name);
						form.style.display = 'none';
						document.body.appendChild(form);

						return form;
					}
				});

/**
 * Class for uploading files using xhr
 * 
 * @inherits qq.UploadHandlerAbstract
 */
qq.UploadHandlerXhr = function(o) {
	qq.UploadHandlerAbstract.apply(this, arguments);

	this._files = [];
	this._xhrs = [];

	// current loaded size in bytes for each file
	this._loaded = [];
};

// static method
qq.UploadHandlerXhr.isSupported = function() {
	var input = document.createElement('input');
	input.type = 'file';

	return ('multiple' in input && typeof File != "undefined"
			&& typeof FormData != "undefined" && typeof (new XMLHttpRequest()).upload != "undefined");
};

// @inherits qq.UploadHandlerAbstract
qq.extend(qq.UploadHandlerXhr.prototype, qq.UploadHandlerAbstract.prototype)

qq.extend(
				qq.UploadHandlerXhr.prototype,
				{
					/**
					 * Adds file to the queue Returns id to use with upload,
					 * cancel
					 */
					add : function(file) {
						if (!(file instanceof File)) {
							throw new Error(
									'Passed obj in not a File (in qq.UploadHandlerXhr)');
						}

						return this._files.push(file) - 1;
					},
					getName : function(id) {
						var file = this._files[id];
						// fix missing name in Safari 4
						// NOTE: fixed missing name firefox 11.0a2 file.fileName
						// is actually undefined
						return (file.fileName !== null && file.fileName !== undefined) ? file.fileName
								: file.name;
					},
					getSize : function(id) {
						var file = this._files[id];
						return file.fileSize != null ? file.fileSize
								: file.size;
					},
					/**
					 * Returns uploaded bytes for file identified by id
					 */
					getLoaded : function(id) {
						return this._loaded[id] || 0;
					},
					/**
					 * Sends the file identified by id and additional query
					 * params to the server
					 * 
					 * @param {Object}
					 *            params name-value string pairs
					 */
					_upload : function(id, params) {
						this._options.onUpload(id, this.getName(id), true);

						var file = this._files[id], name = this.getName(id), size = this.getSize(id);

						this._loaded[id] = 0;

						var xhr = this._xhrs[id] = new XMLHttpRequest();
						var self = this;

						xhr.upload.onprogress = function(e) {
							if (e.lengthComputable) {
								self._loaded[id] = e.loaded;
								self._options.onProgress(id, name, e.loaded,
										e.total);
							}
						};

						xhr.onreadystatechange = function() {
							if (xhr.readyState == 4) {
								self._onComplete(id, xhr);
							}
						};

						// build query string
						params = params || {};
						params[this._options.inputName] = name;
						var queryString = qq.obj2url(params,this._options.action);

						var protocol = this._options.demoMode ? "GET" : "POST";
						xhr.open(protocol, queryString, true);
						xhr.setRequestHeader("X-Requested-With","XMLHttpRequest");
						xhr.setRequestHeader("X-File-Name",encodeURIComponent(name));
						xhr.setRequestHeader("Cache-Control", "no-cache");
						if (this._options.forceMultipart) {
							var formData = new FormData();
							formData.append(this._options.inputName, file);
							file = formData;
						} else {
							xhr.setRequestHeader("Content-Type","application/octet-stream");
							// NOTE: return mime type in xhr works on chrome
							// 16.0.9 firefox 11.0a2
							xhr.setRequestHeader("X-Mime-Type", file.type);
						}
						for (key in this._options.customHeaders) {
							xhr.setRequestHeader(key,this._options.customHeaders[key]);
						}
						;
						xhr.send(file);
					},
					_onComplete : function(id, xhr) {
						"use strict";
						// the request was aborted/cancelled
						if (!this._files[id]) {
							return;
						}

						var name = this.getName(id);
						var size = this.getSize(id);
						var response; // the parsed JSON response from the
										// server, or the empty object if
										// parsing failed.

						this._options.onProgress(id, name, size, size);

						this.log("xhr - server response received");
						this.log("responseText = " + xhr.responseText);

						try {
							if (typeof JSON.parse === "function") {
								response = JSON.parse(xhr.responseText);
							} else {
								response = eval("(" + xhr.responseText + ")");
							}
						} catch (err) {
							response = {};
						}
						if (xhr.status !== 200) {
							this._options.onError(id, name,
									"XHR returned response code " + xhr.status);
						}
						this._options.onComplete(id, name, response);

						this._xhrs[id] = null;
						this._dequeue(id);
					},
					_cancel : function(id) {
						this._options.onCancel(id, this.getName(id));

						this._files[id] = null;

						if (this._xhrs[id]) {
							this._xhrs[id].abort();
							this._xhrs[id] = null;
						}
					}
				});

/**
 * A generic module which supports object disposing in dispose() method.
 */
qq.DisposeSupport = {
	_disposers : [],

	/** Run all registered disposers */
	dispose : function() {
		var disposer;
		while (disposer = this._disposers.shift()) {
			disposer();
		}
	},

	/** Add disposer to the collection */
	addDisposer : function(disposeFunction) {
		this._disposers.push(disposeFunction);
	},

	/** Attach event handler and register de-attacher as a disposer */
	_attach : function() {
		this.addDisposer(qq.attach.apply(this, arguments));
	}
};
